Metrologic Optimus R, Руководство по программированию

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74 "C" Programming Guide For Optimus S/R
Return If successful, it returns 1.
Otherwise, it returns 0.
See Also OSTimeDly
clr_kb
Purpose To clear the keyboard buffer.
Syntax void clr_kb (void);
Example clr_kb();
Description This routine is automatically called by the system upon powering up the
terminal.
Return None
See Also
getchar, kbhit
getchar
Purpose To read one character from the keyboard buffer and then remove it.
Syntax int getchar (void);
Example c = getchar();
if (c > 0) printf ("Key %d pressed",c);
else printf ("No key pressed");
Description This routine can be used with menu operation to detect a shortcut key being
pressed.
Return
If successful, it returns the character read from the keyboard buffer.
Otherwise, it returns 0 to indicate the keyboard buffer is already empty.
See Also clr_kb, kbhit
GetKeyClick
Purpose
To get the current setting of key click.
Syntax int GetKeyClick (void);
Example state = GetKeyClick();
Description The key click is set to be enabled by default, but it can be changed from the
System Menu or through programming.
Return
If key click is enabled, it returns 1~5 to indicate different tones.
Otherwise, it returns 0.
See Also SetKeyClick